| 澳洲坚果根系分布特点 |
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| 引用本文： | 陈 菁,陆超忠,石伟琦,冼皑敏,赵大宣,王文林,覃振师.澳洲坚果根系分布特点[J].热带农业科学,2017,37(6):23-26. |
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| 作者姓名： | 陈 菁 陆超忠 石伟琦 冼皑敏 赵大宣 王文林 覃振师 |
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| 作者单位： | 1. 中国热带农业科学院南亚热带作物研究所/海南省热带作物营养重点实验室 广东湛江 524091;2. 广西南亚热带农业科学研究所 广西龙州 532400 |
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| 基金项目： | 中国热带农业科学院院本级中央级公益性科研院所基本科研业务费专项资助项目(1630062013017) |
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| 摘 要： | 为实现澳洲坚果的精准施肥,本研究以4、8、25 a的H2澳洲坚果树为试材,采用个体收获法,采集以树干为中心,树冠滴水线外约10 cm处(与其他树树冠交叉处)为边的整个圆内的不同距离、不同土层根系,并按其大小进行分级,清冼晾干后测其直径大小、鲜重和水分系数,分析根系在土层内的分布特点。结果表明:(1)4、8 a树0~20 cm土层根系干重显著高于其他层次,而25 a树20~40 cm土层根系分布最多,3种树龄0~40 cm土层根系干重占总根干重比例大于72%;(2)8、25 a树0~20 cm土层末级根干重占总末级根干重比例约为60%,而4 a树仅为44.8%;(3)4、8 a树离树干0~50 cm范围总根干重显著高于50 cm外总根干重,而25 a树50 cm外根干重显著高于0~50 cm范围内根干重,并且8、25 a树50 cm末级根干重占总末级根重比例高于90%,而4 a树则高于68%;(4)除了末级根,3种树龄根系干重基本上是随着根直径减少而减少。
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| 关 键 词： | 澳洲坚果 根系 分布 |
The Distribution Features of Macadamia Roots |
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| CHEN jing,LU Chaozhong,SHI Weiqi,XIAN Aiming,ZHAO Daxiang,WANG WenIin,QIN Zhengshi.The Distribution Features of Macadamia Roots[J].Chinese Journal of Tropical Agriculture,2017,37(6):23-26. |
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| Authors: | CHEN jing LU Chaozhong SHI Weiqi XIAN Aiming ZHAO Daxiang WANG WenIin QIN Zhengshi |
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| Institution: | 1 South Subtropical Crops Research institute of CATAS/ Hainan Key Laboratory of Crops Nutrition, Zhangjiang, Guangdong 524091;1 South Subtropical Crops Research institute of CATAS/ Hainan Key Laboratory of Crops Nutrition, Zhangjiang, Guangdong 524091;1 South Subtropical Crops Research institute of CATAS/ Hainan Key Laboratory of Crops Nutrition, Zhangjiang, Guangdong 524091;1 South Subtropical Crops Research institute of CATAS/ Hainan Key Laboratory of Crops Nutrition, Zhangjiang, Guangdong 524091;2 Guangxi Research Institute of South Subtropical Agriculture, Longzhou, Guangxi 532400;2 Guangxi Research Institute of South Subtropical Agriculture, Longzhou, Guangxi 532400;2 Guangxi Research Institute of South Subtropical Agriculture, Longzhou, Guangxi 532400 |
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| Abstract: | In order to achieve the precise fertilization of macadamia, troots were sampled from 4, 8 or 25 years old macadamia trees (cv.H2) by the way of individual harvesting from different soil layers and from different distance within a circle of 10 cm out of the dripping line of the canopy of macadamia trees. The roots were graded into different sizes. All the samples were weighed after washed, and their water contents were determined. The root distribution was analyzed. The results showed that the dry weight of roots collected from the soil 0 to 20 cm deep in the 4 and 8 years old trees was significantly higher than that collected from the soil of other depths. The number of roots from the soil 20 to 40cm deep was the highest in the tree at the age of 25 years old. For the 4, 8 and 25 years old trees the dry weight of roots from the soil 0 to 40cm deep took up more than 72%of the dry weight of total roots. The dry weight of the lateral roots from the soil 0 to 20cm deep contributed almost 60% to the dry weight of total lateral roots for the 8 and 25 years old trees, and was only 44.8% of that of the total for the 4 years old trees. The dry weight of total roots 0 to 50cm away from the trunk base was greater than that >50 cm away from the trunk base in the 4 and 8 years old trees, while the dry weight of total roots >50 cm away from the trunk base was greater than that 0 to 50 cm away in 25 years old trees. The dry weight of lateral roots >50 cm away from the trunk base made up more than 90% of the dry weight of the total lateral roots in the 8 and 25 years old trees, and was greater than 68%in the 4 years old trees. The dry weight of roots from of the 4, 8 and 25 years old trees decreased with the root diameter except the lateral roots. |
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| Keywords: | macadamia root distribution |
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